Annotation of src/usr.bin/comm/comm.c, Revision 1.10
1.10 ! deraadt 1: /* $OpenBSD: comm.c,v 1.9 2015/10/05 13:30:30 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: comm.c,v 1.10 1995/09/05 19:57:43 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1989, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Case Larsen.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.6 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #include <err.h>
37: #include <limits.h>
38: #include <locale.h>
39: #include <stdio.h>
40: #include <stdlib.h>
41: #include <string.h>
42: #include <unistd.h>
43:
44: #define MAXLINELEN (LINE_MAX + 1)
45:
46: char *tabs[] = { "", "\t", "\t\t" };
47:
1.5 millert 48: FILE *file(const char *);
49: void show(FILE *, char *, char *);
50: void usage(void);
1.1 deraadt 51:
52: int
1.7 deraadt 53: main(int argc, char *argv[])
1.1 deraadt 54: {
55: int comp, file1done, file2done, read1, read2;
56: int ch, flag1, flag2, flag3;
57: FILE *fp1, *fp2;
58: char *col1, *col2, *col3;
59: char **p, line1[MAXLINELEN], line2[MAXLINELEN];
1.5 millert 60: int (*compare)(const char * ,const char *);
1.1 deraadt 61:
62: setlocale(LC_ALL, "");
1.9 deraadt 63:
1.10 ! deraadt 64: if (pledge("stdio rpath", NULL) == -1)
! 65: err(1, "pledge");
1.1 deraadt 66:
67: flag1 = flag2 = flag3 = 1;
1.3 deraadt 68: compare = strcoll;
69: while ((ch = getopt(argc, argv, "123f")) != -1)
1.1 deraadt 70: switch(ch) {
71: case '1':
72: flag1 = 0;
73: break;
74: case '2':
75: flag2 = 0;
76: break;
77: case '3':
78: flag3 = 0;
79: break;
1.3 deraadt 80: case 'f':
81: compare = strcasecmp;
82: break;
1.1 deraadt 83: case '?':
84: default:
85: usage();
86: }
87: argc -= optind;
88: argv += optind;
89:
90: if (argc != 2)
91: usage();
92:
93: fp1 = file(argv[0]);
94: fp2 = file(argv[1]);
95:
96: /* for each column printed, add another tab offset */
97: p = tabs;
98: col1 = col2 = col3 = NULL;
99: if (flag1)
100: col1 = *p++;
101: if (flag2)
102: col2 = *p++;
103: if (flag3)
104: col3 = *p;
105:
106: for (read1 = read2 = 1;;) {
107: /* read next line, check for EOF */
108: if (read1)
109: file1done = !fgets(line1, MAXLINELEN, fp1);
110: if (read2)
111: file2done = !fgets(line2, MAXLINELEN, fp2);
112:
113: /* if one file done, display the rest of the other file */
114: if (file1done) {
115: if (!file2done && col2)
116: show(fp2, col2, line2);
117: break;
118: }
119: if (file2done) {
120: if (!file1done && col1)
121: show(fp1, col1, line1);
122: break;
123: }
124:
125: /* lines are the same */
1.3 deraadt 126: if (!(comp = compare(line1, line2))) {
1.1 deraadt 127: read1 = read2 = 1;
128: if (col3)
129: if (printf("%s%s", col3, line1) < 0)
130: break;
131: continue;
132: }
133:
134: /* lines are different */
135: if (comp < 0) {
136: read1 = 1;
137: read2 = 0;
138: if (col1)
139: if (printf("%s%s", col1, line1) < 0)
140: break;
141: } else {
142: read1 = 0;
143: read2 = 1;
144: if (col2)
145: if (printf("%s%s", col2, line2) < 0)
146: break;
147: }
148: }
149:
150: if (ferror (stdout) || fclose (stdout) == EOF)
151: err(1, "stdout");
152:
153: exit(0);
154: }
155:
156: void
1.7 deraadt 157: show(FILE *fp, char *offset, char *buf)
1.1 deraadt 158: {
159: while (printf("%s%s", offset, buf) >= 0 && fgets(buf, MAXLINELEN, fp))
160: ;
161: }
162:
163: FILE *
1.7 deraadt 164: file(const char *name)
1.1 deraadt 165: {
166: FILE *fp;
167:
168: if (!strcmp(name, "-"))
169: return (stdin);
170: if ((fp = fopen(name, "r")) == NULL)
171: err(1, "%s", name);
172: return (fp);
173: }
174:
175: void
1.7 deraadt 176: usage(void)
1.1 deraadt 177: {
1.4 aaron 178: (void)fprintf(stderr, "usage: comm [-123f] file1 file2\n");
1.1 deraadt 179: exit(1);
180: }
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